Insert element and move elements after in vector - c++

Question

I am writing a linked list using a vector to hold (And I know I shouldn't use a vector). I'm trying to implement a function to insert a node a position x and move all elements after x but for some reason it just takes the element originally at x and over writes all remaining elements with this value.
This is the function I am having problem with:
//Insert element at x index
void LinkedList::insertAt(int x, int data) {
Node* tempNode = new Node();
Node* currentNode = vecList[x];
Node* nextNode = vecList[x + 1];
Node* previousNode = vecList[x - 1];
if(x == count) {
push_back(tempNode, data);
return;
}
else {
count++;
for (int i = 0; i < getSize(); i++){
vecList[x + 1]->next = vecList[x]->next; // tranfer the address of 'temp->next' to 'temp'
vecList[x + 1]->data = vecList[x]->data;
if (vecList[x] == NULL){break;}
}
tempNode->data = data;
tempNode->previous = previousNode;
tempNode->next = nextNode;
tempNode->id = x+1;
vecList[x] = tempNode;
vecList[x - 1]->next = tempNode; //Point previous node to this node
}
}//Adds Node but replaces orignal Node
It places the value passed in into position x, I think my problem is with moving the elements after x.
When I call linkedlist.insertAt(2, 50);, it's doing: 10, 20, 50, 30, 30, but expected: 10, 20, 50, 30 ,40.
Definition of Node:
struct Node {
Node * previous;
Node * next;
int id;
int data;
};

Answer 1

The problem is your loop:
for (int i = 0; i < getSize(); i++){
vecList[x + 1]->next = vecList[x]->next; // tranfer the address of 'temp->next' to 'temp'
vecList[x + 1]->data = vecList[x]->data;
if (vecList[x] == NULL){break;}
}
You're iterating over i, but nothing in the loop actually reads i. So you're just doing the same operation getSize() times. I think you meant to assign vecList[i + 1] to veclist[i]. Also the lower bound of the loop shouldn't be 0, it should be x. Which, for further clarity, the name of that variable should probably be pos or something similar.
Also be careful whenever you are referencing vecList[x + 1] or vecList[x - 1]. What if x is 0 or vecList.size() - 1? You will be pointing to an undefined object.